Abstract
Aim of the study
To retrospectively create a predictive score for estimating amputation-free survival (AFS) in patients with critical limb ischemia (CLI) operated on with the use of a heparin-bonded expanded polytetrafluoroethylene (ePTFE) bypass graft (Hb-ePTFE).
Methods
Over a 13-year period, ending in March 2015, a Hb-ePTFE graft was implanted in 683 patients undergoing below-knee revascularization for CLI in seven Italian vascular hospitals. Data concerning these interventions were retrospectively collected in a multicenter registry with a dedicated database. Univariate and multivariable analyses with Kaplan–Meier estimates were used to identify potential significant predictors of AFS at 5 years, and then a predictive risk score was constructed. A qualitative assessment of the Kaplan–Meier survival estimates for each integer score was performed, and subgroups of risk were stratified on the basis of the primary end point.
Results
Overall, estimated 5-year AFS rate was 48.3 % (SE 0.024). At multivariate analysis, older age, coronary artery disease, end-stage renal disease, tissue loss and poor runoff score were predictors of AFS. The integer score ranged from 0 to 11; Kaplan–Meier analysis for AFS in each score group identified three subgroups with significant differences at 5 years: low-risk subgroup (scores from 0 to 2, 67.7 %), medium-risk subgroup (scores 3 and 4, 49.2 %, p < 0.001 in comparison with low-risk subgroup) and high-risk subgroup (scores from 5 to 11, 25.2 %, p < 0.001 in comparison with either low-risk subgroup or medium-risk subgroup).
Conclusions
A category of low-risk patients with CLI treated with the indexed graft does exist, thus suggesting a primary role for Hb-ePTFE in such patients. A prospective validation of such a score is necessary.
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PROPATEN Italian Registry Group
Coordinating Center: Firenze: Carlo Pratesi, Walter Dorigo, Raffaele Pulli, Alessandro Alessi Innocenti, Giovanni Pratesi; Vascular Surgery, Department of Cardiothoracic and Vascular Surgery, Careggi University Teaching Hospital, University of Florence School of Medicine, Florence. Participating Centers: Avezzano: Giovanni De Blasis, Luciano Scalisi; Vascular and Endovascular Surgery, “SS. Filippo e Nicola” Hospital. Catania: Vincenzo Monaca, Giuseppe Battaglia; Vascular Surgery, “Vittorio Emanuele” Ferrarotto Hospital. Mestre: Vittorio Dorrucci; Vascular Surgery, “Umberto I” Hospital. Reggio Emilio: Enrico Vecchiati, Giovanni Casali; Vascular Surgery, “S. Maria Nuova” Hospital. Terni: Fiore Ferilli, Paolo Ottavi; Vascular Surgery, “S. Maria” Hospital. Varese: Patrizio Castelli, Gabriele Piffaretti, Marco Franchin; Vascular Surgery, Department of Surgery and Morphological Sciences, Circolo University Teaching Hospital, University of Insubria School of Medicine, Varese, Italy.
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Dorigo, W., Piffaretti, G., Pulli, R. et al. A Multicenter Predictive Score for Amputation-Free Survival for Patients Operated on with an Heparin-Bonded ePTFE Graft for Critical Limb Ischemia. World J Surg 41, 306–313 (2017). https://doi.org/10.1007/s00268-016-3674-z
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DOI: https://doi.org/10.1007/s00268-016-3674-z